/*
 * Copyright 2022 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef SkottieTextEditor_DEFINED
#define SkottieTextEditor_DEFINED

#include "include/core/SkPath.h"
#include "modules/skottie/include/SkottieProperty.h"
#include "tools/skui/InputState.h"
#include "tools/skui/ModifierKey.h"

#include <chrono>

namespace skottie_utils {
// A sample WYSIWYG text editor built using the GlyphDecorator API.
class TextEditor final : public skottie::GlyphDecorator {
public:
    TextEditor(std::unique_ptr<skottie::TextPropertyHandle> &&,
        std::vector<std::unique_ptr<skottie::TextPropertyHandle>> &&);
    ~TextEditor() override;

    void toggleEnabled();
    void setEnabled(bool);

    void onDecorate(SkCanvas *, const TextInfo &) override;

    bool onMouseInput(SkScalar x, SkScalar y, skui::InputState state, skui::ModifierKey);

    bool onCharInput(SkUnichar c);

    void setCursorWeight(float w)
    {
        fCursorWeight = w;
    }

private:
    struct GlyphData {
        SkRect fDevBounds; // Glyph bounds mapped to device space.
        size_t fCluster;   // UTF8 cluster index.
    };

    std::tuple<size_t, size_t> currentSelection() const;
    size_t closestGlyph(const SkPoint &pt) const;
    void drawCursor(SkCanvas *, const TextInfo &) const;
    void insertChar(SkUnichar c);
    void deleteChars(size_t offset, size_t count);
    bool deleteSelection();
    void updateDeps(const SkString &);

    const std::unique_ptr<skottie::TextPropertyHandle> fTextProp;
    const std::vector<std::unique_ptr<skottie::TextPropertyHandle>> fDependentProps;
    const SkPath fCursorPath;
    const SkRect fCursorBounds;

    std::vector<GlyphData> fGlyphData;
    std::tuple<size_t, size_t> fSelection = { 0, 0 }; // Indices in the glyphs domain.
    size_t fCursorIndex = 0;                          // Index in the UTF8 domain.
    float fCursorWeight = 1;
    bool fEnabled = false;
    bool fMouseDown = false;

    std::chrono::time_point<std::chrono::steady_clock> fTimeBase;
};
} // namespace skottie_utils

#endif // SkottieTextEditor_DEFINED
